#all{
	width: 1200px;
	background-color: pink;
	margin: 0 auto;
}
#nav{
	background-color: beige;
	height: 70px;
}
#content,#aside{
	height: 400px;
}
#content{
	width: 800px;
	background-color: aqua;
	float: left;
}
#aside{
	width: 380px;
	background-color: aquamarine;
	float: right;
}
#header,#footer{
	height: 100px;
	
}
#header{
	background-color: brown;
}
#footer{
	background-color: coral;
	clear: both;
}
